该部分是云台控制的模拟，有窗口的收缩，重载MFC基类实现按钮图标随鼠标点击变形，鼠标左键按下与弹起的事件响应。重载CButton类。-That part of the PTZ control simulation, with windows shrink, overloading MFC base class implementation deformation button icons with a mouse click, left mouse button pressed and boun